Abstract
UDC 621.762; 537.523.4
DOI https://doi.org/10.5281/zenodo.1051291
The work is devoted to the deposition of Ti-Ni-Zr-Mo-Al-C composite coatings on Ti6Al4V alloy by electro-spark treatment in a granules medium consisting of individual metals and Ti3Al + 10%C alloy. The character of mass transfer during the deposition of coatings was studied and it was found that the mass transfer coefficient was 18%. The thickness of the deposited coatings was about 50 μm. According to the X-ray analysis, the coating composition consists of intermetallides AlNi2Ti, MoNi4 and NiTi. The coatings roughness (Ra) was about 3 μm. The microhardness of the deposited layer was 3 times higher than that of the titanium alloy Ti6Al4V. The wear resistance of Ty-Ni-Zr-Mo-Al-C coatings with dry sliding friction against P6M5 steel was 5 times higher than that of the Ti6Al4V alloy. The use of Ti-Ni-Zr-Mo-Al-C coating on Ti6Al4V alloy increases its surface resistance to high-temperature gas corrosion by a factor of two. The proposed approach makes it possible to obtain electro-spark composite coatings on the base of multicomponent alloys in the automatic mode without the use of complex hardware and software, not inferior to traditional ESD coatings.
Keywords: titanium alloy Ti6Al4V, Ti-Ni-Zr-Mo-Al-C composite coatings, electro-spark deposition, electro-spark granules deposition, wear resistance, oxidation resistance.